#include <bits/stdc++.h>
using namespace std;
typedef long long LL;
const int N = 20;

LL n;
LL f[N];

void init()
{
	f[0] = 1;
	for(int i = 1;i <= n;i ++) f[i] = f[i - 1] * (4 * i - 2) / (i + 1);
}

int main()
{
	cin >> n;
	init();
	cout << f[n] << endl;
	return 0;
}